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Item Untitled(2019-07-11) ; Gezmis, Oguz; ; Papanikolas, Matthew A.; ; ; Masri, Riad; Young, Matthew P.; Zhang, XianyangItem Untitled(2019-03-28) ; Barnhart, Elisabeth Creasman; ; Buschang, Peter H; ; ; Campbell, Phillip M; Julien, Katie; Noureldin, Amal; Svoboda, KathyItem Untitled(2019-03-19) ; Baker, Mitchell Wade; ; Strong, Jr., Robert; ; ; Piña, Jr., Manuel; Hamie, SilvaItem Untitled(2019-04-16) ; Ryan, Jennifer Michelle; ; Buschang, Peter H; ; ; Campbell, Phillip; Nourel-Din, AmalItem Untitled(2018-05-27) ; Kuzmin, Gleb Andrejevich; ; Akabani, Gamal; ; ; Ford, John; Wilson-Robles, Heather; Deveau, Michael; Kornegay, Joe; Lee, ChoonsikItem 0-g annular flow and 1-g stratified flow single component two-phase condensation modeling and experiments(Texas A&M University, 1993) Baranek, PascaleNot availableItem A 0.18-μm BICMOS 20-57 GHz Ultra-Wideband Low-Noise Amplifier Utilizing Frequency-Controlled Positive-Negative Feedback Technique(2015-12-02) Luo, Yuan; Nguyen, Cam; Sánchez-Sinencio, Edgar; Kish, Laszlo; Mohanty, BinayakSilicon based complementary metallic oxide semiconductor (CMOS) and Bipolar Complementary Metal Oxide Semiconductor (BiCMOS) radio frequency integrated circuits (RFICs), including microwave and millimeter-wave (MMW), are attractive for wireless communication and sensing systems due to their small chip size and facilitation in system-on-chip integration. One of the most important RFICs is the low-noise amplifier (LNA). The design of CMOS/BiCMOS wideband LNAs at MMW frequencies, especially those working across several decades of frequency, is challenging due to various issues. For instance, the device parasitic and inter-coupling between nearby elements in highly condensed chip areas limits the operating bandwidth and performance, and the conductive silicon substrates lead to the inevitable low quality factor of passive elements. In this work, a MMW BiCMOS ultra-wideband LNA across 20 to 57 GHz is presented along with the analysis, design and measurement results. To overcome the upper-band gain degradation and improve the in-band flatness, a novel frequency controlled positive-negative (P-N) feedback topology is adopted to modify the gain response by boosting the gain at the upper-band while suppressing that at the lower-band. To reduce overall power consumption, the first and second stages of the amplifier are stacked between supply voltage and DC ground to utilize the same DC current. At the output of amplifier, a shunt-peaking load stage is utilized to achieve wideband output matching. The designed ultra-wideband MMW LNA is fabricated in JAZZ 0.18-μm BiCMOS technology. It shows a measured power gain of 10.5 ± 0.5 dB, a noise figure between 5.1-7.0 dB, input and output return losses better than -10 and -15 dB, respectively, an input 1 dB compression point higher than -19 dBm, and an input third-order intercept point greater than -8 dBm. It dissipates 16.6 mW from 1.8 V DC supply and has a chip area of 700×400 μm^2.Item 1,1-bis(3-indolyl)-1-(p-substitutedphenyl) methanes induce apoptosis and inhibit renal cell carcinoma growth(2009-06-02) York, Melissa Dawn; Stephen, Safe H; Burghardt, Robert C.; Phillips, Timothy DRenal cell carcinoma (RCC) accounts for 85% of kidney cancer incidence in the US. Since 1950 there has been a 126% increase in kidney cancer incidence in the US. Thirty percent of new patients present with a localized easily treatable carcinoma while 30% of patients present with a high-grade metastatic carcinoma. Five-year survival rates for metastatic RCC is 6-12 months (Lipworth et al, 2006). Current disease treatment options for metastasis include chemotherapy and radiation (8% response rate), immunotherapy (15-30% response rate) and newly developed angiogenesis inhibitors which are in phase III trials (Staehler et el, 2005). In RCC cells, it has been shown that PPARγ agonists inhibit cell proliferation, induce apoptosis, and induce anti-angiogenic effects in vitro. Unlike most tumor types, PPARγ is downregulated in tissue samples from 47 RCC patients. However, in cell culture studies PPARγ expression does not correlate with growth inhibitory or apoptotic effects of PPARγ agonists in renal cell lines indicating that PPARγ independent responses may play a large role in actions associated with the PPARγ agonists (Yuan et al, 2006). 1,1-Bis(3'-indolyl)-1-(p-substitutedphenyl)methanes containing p-trifluoromethyl, p-t-butyl and p-phenyl substituents activate peroxisome proliferator-activated receptor (PPAR) and inhibit growth of ACHN and 786-0 renal cell carcinoma cell lines. PPAR is overexpressed in ACHN cells and barely detectable in 786-0 cells, and treatment with the t-butyl analog (DIM-C-pPhtBu) induces cell cyle inhibition. DIM-C-pPhtBu also induced several common PPAR-independent proapoptotic responses in ACHN and 786-0 cells, including increased expression of nonsteroidal antiimflammatory drug-activated gene-1 (NAG-1) and endoplasmic reticulum stress which activates death receptor 5 and the extrinsic pathway of apoptosis. In addition, DIM-C-pPhtbu (40 mg/kg/d) also inhibited tumor growth in an orthotopic mouse model for renal carcinogenesis, and this was accompanied by induction of apoptosis in renal tumors treated with DIM-C-pPhtBu but not in tumors treated with the corn oil vehicle (control). Thus, DIM-C-pPhtBu and related compounds represent a novel class of mechanism-based drugs that have potential for treatment of renal adenocarcinoma for which there are currently limited options for successful chemotherapy.Item A 1.8V 10-bit 10MS/sec pipelined ADC(Texas A&M University, 1997) Gunay, Zeki SezginThe objective of this thesis is to develop a pipelined analog-to-digital converter which operates under a single supply voltage of 1.8V and is capable of resolving 10 bits at a rate of IOMS/sec. Although the overall architecture of the developed pipelined converter is a general one at the system level, a family of new low-voltage building blocks is proposed. The amplifiers and comparators which are designed to perform interstage processing have high gain-bandwidth products and they are capable of operating at supply levels of less than the initial specification of 1.8V. To test the concepts used to design important blocks such as amplifiers and comparators, a chip prototype amplifier is fabricated in a 1.2nm standard CMOS process and is tested to be functional. The entire converter system is designed using a 0.5/,nm standard CMOS process and its layout is completed. A patent application is filed for the offset cancelation utilizing capacitive levelshift devices for single-ended amplifiers.Item A 1.8V 2-2 cascade Sigma-Delta modulator for high speed applications(Texas A&M University, 2002) Lee, Kye-ShinIn order to satisfy today's most important requirements of the A/D and D/A converters that are low voltage and high speed operation, a low voltage and high speed circuit solutions for [] modulators are strongly demanding. However, simply reducing the supply voltage and increasing the clock frequency of the [] modulator will introduce severe constraints to the design. In this thesis, a 1.8V 2-2 cascade [] modulator with 1MHz signal bandwidth is realized by employing a modified [] modulator structure which can limit the output swing of the integrator within half the reference voltage. As a result, the supply voltage can be easily reduced without any degradation of the modulator performance. Moreover, the slew rate and bandwidth requirements of the OpAmp are much more alleviated. Also, using only single bit quantizers in each stage, linearity and matching problems are not critical. Circuit level simulation results show a peak SNR of 77.3dB and a peak SNDR of 72.1dB which corresponds to a nearly 13 bit resolution.Item A 10-year content analysis to assess research theme areas in agricultural education: gap analysis of future research priorities in the discipline.(2009-05-15) Edgar, Leslie Dawn; Briers, Gary; Rutherford, Tracy; Dooley, Kim; Boyd, Barry; Williams, Gary W.The field of agricultural education relies on multiple research journals to disseminate findings. This study focused on a 10-year content analysis of research published in premier journals in agricultural education. The study ascertained primary research themes, types of research conducted, prolifically published authors, frequently cited authors, and frequently cited referenced works, and discussed how the formation and usage of research in agricultural education has changed from 1997 to 2006. The study sought assistance from agricultural educators to narrow the focus of the study and to ensure study content validity. A conceptual model, based on a thorough review of literature and a focus on the peer discipline areas of agricultural education, guided the study. The study utilized a field study and employed descriptive statistics. Premier agricultural education (AGED) journals were identified: the Journal of Agricultural Education (93%); Journal of International Agricultural and Extension Education (67%); Journal of Extension (63%); North American Colleges and Teachers of Agriculture Journal (48%); Journal of Applied Communications (41%); and Journal of Leadership Education (41%). The study identified primary and secondary research themes, prolific authorship, research methods and types, and frequently cited authors and referenced works in each of the identified premier AGED journals. The research used compiled data, from each of the research journals, to analyze the frequencies and gaps identified in the National Research Agenda [NRA]: Agricultural Education and Communication 2007-2010 (2007). Agricultural education in domestic and international settings: Extension and outreach was the research priority area noted as the most frequently identified in past research and no gaps were identified in the NRA. To continue to strengthen the agricultural education discipline, research from this study should be used to adjust research priority areas in the NRA and on the regional and state levels.Item A 100-kc modulation system for an EPR microwave spectrometer(Texas A&M University, 1964) Stewart, Frank EdwinNot availableItem 1000 Words(2019-09-17) Texas A&M University at QatarItem A 10Gb/s Full On-chip Bang-Bang Clock and Data Recovery System Using an Adaptive Loop Bandwidth Strategy(2010-10-12) Jeon, Hyung-Joon; Silva-Martinez, Jose; Sanchez-Sinencio, Edgar; Li, Peng; Parlos, Alexander G.As demand for higher bandwidth I/O grows, the front end design of serial link becomes significant to overcome stringent timing requirements on noisy and bandwidthlimited channels. As a clock reconstructing module in a receiver, the recovered clock quality of Clock and Data Recovery is the main issue of the receiver performance. However, from unknown incoming jitter, it is difficult to optimize loop dynamics to minimize steady-state and dynamic jitter. In this thesis a 10 Gb/s adaptive loop bandwidth clock and data recovery circuit with on-chip loop filter is presented. The proposed system optimizes the loop bandwidth adaptively to minimize jitter so that it leads to an improved jitter tolerance performance. This architecture tunes the loop bandwidth by a factor of eight based on the phase information of incoming data. The resulting architecture performs as good as a maximum fixed loop bandwidth CDR while tracking high speed input jitter and as good as a minimum fixed bandwidth CDR while suppressing wide bandwidth steady-state jitter. By employing a mixed mode predictor, high updating rate loop bandwidth adaptation is achieved with low power consumption. Another relevant feature is that it integrates a typically large off-chip filter using a capacitance multiplication technique that employs dual charge pumps. The functionality of the proposed architecture has been verified through schematic and behavioral model simulations. In the simulation, the performance of jitter tolerance is confirmed that the proposed solution provides improved results and robustness to the variation of jitter profile. Its applicability to industrial standards is also verified by the jitter tolerance passing SONET OC-192 successfully.Item A 113 L/min ambient aerosol sampler for collection of thoracic and respirable fractions(Texas A&M University, 1981) Rue, Clayton MatthewNot availableItem 11th Grade Students' English Reading Motivation, Language Problems and Reading Achievement in Taiwan(2012-07-16) Su, Jung-Hsuan; Dixon, L. Quentin; McTigue, Erin; Goetz, Ernest; Helfeldt, JackMotivation has been viewed as a very influential factor to successful reading for English as foreign language learners. Learners can be motivated to read English by extrinsic or intrinsic motivation, and the motivational orientations could also influence their reading achievement. However, language problems that EFL learners encounter while reading can affect their willingness to read as well as their reading achievement. The purpose of this study was to investigate Taiwanese EFL students’ English reading motivation and its relationship with perceived language problems and reading achievement. 302 11th grade students from an urban district in southern Taiwan participated in the study. Measures included an English reading comprehension test, an English reading motivation questionnaire, and a questionnaire regarding language problems in reading English. A factor analysis was used to determine the motivational orientations. Multiple regression and correlation analysis were performed to examine the relationship among reading motivation, language problems, and reading achievement. The results showed that: 1) Taiwanese senior high school students were largely motivated to read English by extrinsic motivation, specifically the importance and instrumental utility of reading English and the drive for recognition and competition, although they could also be motivated by intrinsic motivation to read English for knowledge and social purposes. Moreover, extrinsic motivation to read for compliance was significantly associated with their English reading scores. 2) While reading English, unknown idiomatic expressions and vocabulary were frequently reported language problems that influenced students’ willingness to read. Nevertheless, lack of grammar knowledge was generally not considered a big language problem to most of the students while reading. 3) Language problems in reading English and reading motivation were correlated, and motivation to read for compliance, grammar knowledge, and overall reading comprehension were significant predictors of students’ English reading scores. This study highlights the influential role of extrinsic motivation to EFL students in English reading and the importance of knowledge of vocabulary and idiomatic expressions in order to help understand the meaning of English texts. It provides implications for English teachers in designing appropriate curriculum that suits students’ needs and interests, and also suggestions for choosing proper reading materials.Item 1255 LIVINGMetzler, Jake R.; De Lima Vaz Xavier, Davi; Borges, Alejandro; Campagnol, Gabriela; Rybkowski, Zofia; Aitani, Koichiro; Hawkins, AndrewA mixed-use development is a combination of multiple programmatic functions that can promote walkability, create vibrant living and working environments, offer affordable housing, increase economic mechanism growth, and diversify communities while strengthening a city. 1255 Living is a final study proposal, in response to, The Association of Collegiate Schools of Architecture (ACSA) TIMBER IN THE CITY 4: Urban Habitats Competition. The competition introduces a selected site located in Atlanta, Georgia that sits directly on top and replaces a single use of the Arts Center Marta Station. The public transportation site offers both unique and challenging opportunities based on its location setting, surrounding functions, and typography. 1255 Living is an inventive design that explores creative design concepts to blend architecture, art, landscape, and technology by unique user experiences and function. The project proposes an emphasis on the interrelationships between urban vertical housing, innovated design solutions, sustainable strategies, and car free living and working environments. Through an influence of multiple typology integrations, excavation of the site, and removal of a current pedestrian bridge has generated a unique design proposal and approach that focuses on the interactions between the primary programmatic categories: residential living, urban market, and community use. 1255 Living’s contemporary design, elegant aesthetics, and strategic use with the local North Georgia Timber harvesting mill can optimally serve as the driving force for a socially, culturally diverse, innovative timber model for a sustainable urban habitat in Midtown Atlanta. This project is inspired by the thriving Arts Center Marta Station and how urbanized living can integrate itself to the flow of public transit, circulation, and function.Item The 1400-1240 A absorption system of carbon dioxide(1971) Petty, William Restelle; Coon, Jesse B.; Hedges, R. M.; Klipple, E. C.Item 142pr glass seeds for the brachytherapy of prostate cancer(Texas A&M University, 2007-09-17) Jung, Jae Won; Reece, Warren D.; Braby, Leslie A.; Ford, John; Walker, Michael A.A beta-emitting glass seed was proposed for the brachytherapy treatment of prostate cancer. Criteria for seed design were derived and several beta-emitting nuclides were examined for suitability. 142Pr was selected as the isotope of choice. Seeds 0.08 cm in diameter and 0.9 cm long were manufactured for testing. The seeds were activated in the Texas A&M University research reactor. The activity produced was as expected when considering the meta-stable state and epi-thermal neutron flux. The MCNP5 Monte Carlo code was used to calculate the quantitative dosimetric parameters suggested in the American Association of Physicists in Medicine (AAPM) TG-43/60. The Monte Carlo calculation results were compared with those from a dose point kernel code. The dose profiles agree well with each other. The gamma dose of 142Pr was evaluated. The gamma dose is 0.3 Gy at 1.0 cm with initial activity of 5.95 mCi and is insignificant to other organs. Measurements were performed to assess the 2-dimensional axial dose distributions using Gafchromic radiochromic film. The radiochromic film was calibrated using an X-ray machine calibrated against a National Institute of Standards and Technology (NIST) traceable ion chamber. A calibration curve was derived using a least squares fit of a second order polynomial. The measured dose distribution agrees well with results from the Monte Carlo simulation. The dose was 130.8 Gy at 6 mm from the seed center with initial activity of 5.95 mCi. AAPM TG-43/60 parameters were determined. The reference dose rate for 2 mm and 6 mm were 0.67 and 0.02 cGy/s/mCi, respectively. The geometry function, radial dose function and anisotropy function were generated.Item 15 Steps to minimizing theft of horses and equipment(AgriLife Extension, Texas A&M University System) Gibbs, Pete